I have a tumbler full of walnut shell. It can be much more progressive then the seed, if charged. I'm using it right now to restore some silver damaged by Katrina. The level of abrasion depends what you charge your walnut with, or if it's not charged at all. Currently mine is charged with fine rouge. Corn cob is another like medium, is much cheaper, and holds a charge just as well. My concern would be you got the dip off, now you need to remove the residual rouge. Can you say ultrasonic? Now we're back where Mark left off.
Frank
BTW don't use the walnut for jewelers for cleaning brass casings, most are pre charge with rouge and the residual, unless removed, will affect the reloaded rounds. Make sure the walnut states uncharged.
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